PROBLEM DESCRIPTION: This fix provides an update to support IBM fixes OA53954 and OA53955 for z/OS 2.1/2.2 and z/OS 2.3, respectively. SYMPTOMS: DEBCHK processing may encounter an S16E-28 abend with the IBM fix installed. IMPACT: S16E-28 abend in DEBCHK processing with the IBM fix installed. CIRCUMVENTION: Apply this fix to correct the processing that occurs with the IBM fixes installed.